{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The light sources used in current photodynamic therapy are mainly lasers or light emitting diodes , which are not suitable to treat large - volume tumors and those located in the inner body ."}
{"Chemical": []}